Genesis and Geologic Significance of Late Triassic Monzonitic Granite in Jinshantun,the Southeast of Xiao Hinggan Mountains

Geoscience ›› 2008, Vol. 22 ›› Issue (2): 197-206.

• Engineering Geology and Environmental Geology • Previous Articles Next Articles

Genesis and Geologic Significance of Late Triassic Monzonitic Granite in Jinshantun,the Southeast of Xiao Hinggan Mountains

HAN Zhen-zhe^1,2,3,ZHAO Hai-ling^1,2,SU Shi-jie⁴,LANG Hai-tao⁵,YU Rong-wen³,YIN Zhi-gang³

1State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing100083, China;
2Key Laboratory of Lithosphere Tectonics and Lithoprobing Technology of Ministry of Education, China University of Geosciences, Beijing100083, China;
3Qiqihar Branch,Heilongjiang Institute of Geological Investigation and Research,Qiqihar，Heilongjiang161005, China;
4Inner Mongolian Institute of Geological Survey,Hohhot,Inner Mongolia010020,China;
5Anhui Institute of Exploration Technique,Bengbu，Anhui233000, China

Received:2007-12-02 Revised:2008-03-08 Online:2008-02-20 Published:2008-02-20

Abstract

Abstract:

Late Triassic porphyritic-like monzonitic granite association,nearly northern and southern trend, are widely distributed in the area of Jinshantun,the southeast of Xiao Hinggan Mountains.Dark microgranular dioritic enclaves and medium-basic dikites swarm are wide-spreadly distributed in these rocks.Through the study of the macroscopic and microscopic feature and geochemistry of mediumbasic dikites,the pluton and its enclaves, the enclaves mainly present perfectly round shape,displaying the feature of apparently plastic flow,having representative magma structure, acicular apatite and containing K-feldspar,quartz megacryst of host rock, having apparent characteristic of magma mingling genesis enclaves.Medium-basic dikites swarm of the pluton have diversified shapes, and they present mini wave-like or flat contact with granite,show feldspar phenocryst of host rock, display synhypomagmatic dyke swarm that is formed by crustmantle magmatic mixing.The above study suggest that Late Triassic monzonitic granite have obvious genetic feature of magma mingling,and their formation are probably in connection with underplating of basic magma, under the mechanism of postcollisional extensional dynamics.

Key words: monzonitic granite, mafic microgranitoid enclave, genesis of magma mingling, underplating, the southeast of Xiao Hinggan Mountains

CLC Number:

P588.12⁺1

HAN Zhen-zhe,ZHAO Hai-ling,SU Shi-jie,LANG Hai-tao,YU Rong-wen,YIN Zhi-gang. Genesis and Geologic Significance of Late Triassic Monzonitic Granite in Jinshantun,the Southeast of Xiao Hinggan Mountains[J]. Geoscience, 2008, 22(2): 197-206.

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Genesis and Geologic Significance of Late Triassic Monzonitic Granite in Jinshantun,the Southeast of Xiao Hinggan Mountains

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